I have A DELL XPS 420 i was going upgrade the cpu From Q6600 Q9550 will it work with the mb it came with.
You can get more out of your Q6600 by overclocking it.
Fool the system into thinking the chip works off a 333 mhz FSB, and you'll get 3.0 out of it;BSEL mod
There are a couple of programs known to work with Dells that can gain you 4-500 mhz, here's one;SetFSB
Both cost nothing ( unless you do the conductive ink mod and have to buy the ink ) and have been proven to work on the XPS 420.